[SECURITY-L] CAIS-Alerta: Vulnerabilidade no Cliente DNS (MS08-020)

[CSIRT - UNICAMP]

----- Forwarded message from Centro de Atendimento a Incidentes de Seguranca <cais em cais.rnp.br> -----

From: Centro de Atendimento a Incidentes de Seguranca <cais em cais.rnp.br>
Subject:  CAIS-Alerta: Vulnerabilidade no Cliente DNS (MS08-020)
To: pop-seg em cais.rnp.br, rnp-alerta em cais.rnp.br, rnp-seg em cais.rnp.br
Date: Tue, 8 Apr 2008 17:16:28 -0300 (BRT)

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Prezados,

O CAIS esta' repassando o alerta da Microsoft, intitulado "MS08-020 - 
Important Vulnerability in DNS Client Could Allow Spoofing (945553)", que 
trata de uma vulnerabilidade recem-descoberta nos clientes de DNS do 
Windows.

A vulnerabilidade existe devido `a insuficiente aleatoriedade utilizada na 
escolha de valores para as transacoes DNS quando uma consulta deste tipo 
e' realizada.

Caso um atacante consiga explorar com sucesso esta vulnerabilidade, ele 
podera impersonalizar ou redirecionar para maquinas ilegitimas o trafego 
de internet do sistema.


Sistemas afetados:

. Microsoft Windows 2000 Service Pack 4
. Windows XP Service Pack 2
. Windows XP Professional x64 Edition
. Windows XP Professional x64 Edition Service Pack 2
. Windows Server 2003 Service Pack 1
. Windows Server 2003 Service Pack 2
. Windows Server 2003 x64 Edition
. Windows Server 2003 x64 Edition Service Pack 2
. Windows Server 2003 com SP1 para Sistemas baseados em Itanium
. Windows Server 2003 com SP2 para Sistemas baseados em Itanium
. Windows Vista
. Windows Vista x64 Edition


Correcoes disponiveis:

Recomenda-se fazer a atualizacao para as versoes disponiveis em :

. Microsoft Windows 2000 Service Pack 4
  http://www.microsoft.com/downloads/details.aspx?FamilyId=41326ade-96b6-47ce-9291-d4e3039471c4

. Windows XP Service Pack 2
  http://www.microsoft.com/downloads/details.aspx?FamilyID=893f4cef-0395-4c44-ba28-7a10b6e7dd48

. Windows XP Professional x64 Edition
  http://www.microsoft.com/downloads/details.aspx?FamilyID=8fdd1207-6e93-4c43-bacc-fe3623a6ebe7

. Windows XP Professional x64 Edition Service Pack 2
  http://www.microsoft.com/downloads/details.aspx?FamilyID=8fdd1207-6e93-4c43-bacc-fe3623a6ebe7

. Windows Server 2003 Service Pack 1
  http://www.microsoft.com/downloads/details.aspx?FamilyId=214bd8f5-6eb2-414c-b013-c516a306d692

. Windows Server 2003 Service Pack 2
  http://www.microsoft.com/downloads/details.aspx?FamilyId=214bd8f5-6eb2-414c-b013-c516a306d692

. Windows Server 2003 x64 Edition
  http://www.microsoft.com/downloads/details.aspx?FamilyId=fd123394-a5d6-4b55-be74-2938f52ce922

. Windows Server 2003 x64 Edition Service Pack 2
  http://www.microsoft.com/downloads/details.aspx?FamilyId=fd123394-a5d6-4b55-be74-2938f52ce922

. Windows Server 2003 com SP1 para Sistemas baseados em Itanium
  http://www.microsoft.com/downloads/details.aspx?FamilyId=e0e63f03-904d-47ee-94fc-51a8dea668eb

. Windows Server 2003 com SP2 para Sistemas baseados em Itanium
  http://www.microsoft.com/downloads/details.aspx?FamilyId=e0e63f03-904d-47ee-94fc-51a8dea668eb

. Windows Vista
  http://www.microsoft.com/downloads/details.aspx?FamilyID=8203d303-c855-4579-9bbf-b06ddf5c1b87

. Windows Vista x64 Edition
  http://www.microsoft.com/downloads/details.aspx?FamilyID=73f3a234-3973-4467-be7e-69efa7ee978c


Mais informacoes:

. MS08-020 - Important Vulnerability in DNS Client Could Allow Spoofing (945553)
  http://www.microsoft.com/technet/security/Bulletin/MS08-020.mspx

. Microsoft Brasil Security
  http://www.microsoft.com/brasil/security

. SANS ISC Handler's Diary 2008-04-08: April 2008 - Black Tuesday Overview
  http://www.isc.sans.org/diary.html?storyid=4264

. Technet Brasil - Central de Seguranca
  http://www.technetbrasil.com.br/seguranca

. Windows Live OneCare
  http://safety.live.com/site/pt-BR/default.htm


Identificador CVE (http://cve.mitre.org): CVE-2008-0087


O CAIS recomenda que os administradores mantenham seus sistemas e
aplicativos sempre atualizados, de acordo com as ultimas versoes e
correcoes oferecidas pelos fabricantes.


Os Alertas do CAIS tambem sao oferecidos no formato RSS/RDF:
http://www.rnp.br/cais/alertas/rss.xml


Atenciosamente,

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